U.S. stock futures fall on Wednesday ahead of a key summit on trade between Europe and the United States; AT&T slips as second-quarter revenue misses estimates; Facebook and Boeing are highlights of Wednesday's earnings calendar.

U.S. stock futures are flat on Wednesday, following an upbeat assessment of the U.S. economy from Federal Reserve Chairman Jerome Powell; Morgan Stanley and IBM report earnings; Google faces a record $5 billion fine from the European Union.

Texas Instruments Incorporated TXN CEO Brian Crutcher has resigned his posts as CEO, president and board member after violating the company's code of conduct with his personal actions, the Dallas-based company best known for its graphing calculators announced alongside its quarterly earnings Tuesday.